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Self-adaptive distance protection method and system for a power transmission line

A technology of action time and transmission lines, applied in the field of power systems, can solve the problems of inability to protect the full length of lower-level lines and insufficient sensitivity of remote backup protection, etc., to reduce the workload of setting calculations, quickly remove faults, and take into account selectivity and rapidity Effect

Pending Publication Date: 2021-07-13
CHINA ELECTRIC POWER RES INST +2
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Problems solved by technology

[0005] Embodiments of the present disclosure provide an adaptive distance protection method and system for transmission lines to at least solve the problems existing in the prior art. For the power grid in Northwest my country, there are a large number of long transmission lines with 110kV and below, and remote backup is common. The problem of insufficient protection sensitivity, even if the impedance setting value is set to the maximum, the technical problem that the entire length of the lower line cannot be protected

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  • Self-adaptive distance protection method and system for a power transmission line
  • Self-adaptive distance protection method and system for a power transmission line
  • Self-adaptive distance protection method and system for a power transmission line

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Embodiment Construction

[0014] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0015] Unless otherwise specified, the terms (including scientific and technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or over...

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Abstract

The invention discloses a self-adaptive distance protection method and system for a power transmission line. The method comprises the steps of: determining the voltage power frequency phasor and the current power frequency phasor according to pre-collected current and voltage sampling values, and after a fault occurs in the voltage power frequency phasor and the current power frequency phasor, enabling the fault starting element and the phase selection element to act to select a fault phase; selecting different impedance calculation methods according to different fault types, calculating positive sequence fault impedance through the voltage power frequency phasor and the current power frequency phasor, and calculating a fault distance according to the positive sequence fault impedance and the positive sequence impedance of the line per unit length; and calculating protection action time according to the fault distance.

Description

technical field [0001] The present application relates to the technical field of power systems, in particular to a method and system for calculating the protection action time of transmission lines. Background technique [0002] Distance protection is a protection method that uses the ratio of the measured voltage and measured current at the protection installation to identify and locate faults. It has the advantages of not requiring channels and being less affected by the operation mode. It has always been an important type of protection. The above voltage level transmission lines are widely used. [0003] The traditional line distance protection adopts a staged coordination method, and the action setting and action delay of the backup protection are preset fixed values, so it needs to be recalculated after the grid structure changes or the operation mode changes. The fixed value of the traditional distance protection is calculated offline by the dispatcher according to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01R31/08G01R31/58
CPCG01R31/085G01R31/58Y04S10/52
Inventor 王书扬李天华王兴国梁英杨国生周泽昕杜丁香陈争光郭雅蓉程琪曹虹戴飞扬刘佳琪范荣奇吴秋丽李靖戈宁宫德锋陈雪峰王宝松王玥婷杨超史文芳李玉敏刘萌
Owner CHINA ELECTRIC POWER RES INST
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